What are the opening hours?

Monday 4:30am - 8:30pm Tuesday 4:30am - 8:30pm Wednesday 4:30am - 8:30pm Thursday 4:30am - 8:30pm Friday 4:30am - 7:15pm Saturday 7am - 12:45pm Sunday 7am - 12:45pm

Orangetheory Fitness Thornton

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Thornton, CO
Orangetheory Fitness Thornton

Orangetheory Fitness is heart rate zone training that delivers a full body group workout.
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Orangetheory Fitness in Thornton, CO offers heart rate zone training that delivers a smarter way to work out. Experience an expertly designed, full-body group workout combining cardio and strength training with real-time tracking for measurable results you can see and feel. Here in Thornton, your heart rate sets the pace, enabling our triple-certified coaches to get you into the optimal zone. The result is a personalized fitness experience tailored to your fitness level.

10/28/2025

All Out for breast cancer awareness. 💕🧡

Four years ago, Heather R. walked into OTF for the first time, and what started as a workout quickly became something more — a second family, a support system, and a source of strength.

At only 38 years old, Heather received a breast cancer diagnosis and underwent a double mastectomy. Because she chose surgery, she was able to bypass chemo and radiation — but her journey was far from easy.

"I will say that one of the first things that crossed my mind was how long I would have to take off from OTF. When I got back, I was super nervous and had no idea what I could and couldn't do. The coaches were amazing and gave me alternatives. I shed a lot of tears those first several classes after realizing my body was different now. The coaches were very attentive and encouraging when I was feeling defeated." But she found her strength again.

Heather also leaves us with an important reminder: “If you’ve been putting off your mammogram, consider this your sign. Make the appointment. Do your self-exams. Take care of you.” 💗

This Breast Cancer Awareness Month, we honor Heather — and everyone fighting, surviving, and thriving. Heather, we’re so grateful for your courage, your voice, and your presence in our OTF family. 🧡

10/28/2025

Day 5 of Hell Week: Chains of the Coven. 🧙‍♀️ From the very first second, the witches had us bound. ⛓️ The Spell of Restriction held us tight — inclines stealing our speed, bands clipping our range, rows stalling us like a red light. But every break in the chains was a reminder: Freedom never felt so good.

10/27/2025

Tick… tock… the Spell of the Clock was cast. ⏳ Day 4 of Hell Week: Omen of the Hourglass became a race against the witches’ cruelest weapon — the clock itself. Time is ruthless under their spell. 🪄

10/26/2025

Day 3 of Hell Week is a cruel balancing act. Stability shattered. Spells cast. Balance bewitched. 🧙‍♀️ The witches have brewed instability — surges, wobbles, and no safe footing in sight. 🔮

10/25/2025

Gravity never plays fair, especially when witches are in charge. 🪄Day 2 of Hell Week and the Spell of Gravity has us in its grip — inclines that won’t quit, weights that feel possessed, and no way out but through. 🖤

10/24/2025

we don’t skip celebrations around here 🧡

10/24/2025

The witches didn’t waste any time — Day 1 of Hell Week and Havoc’s Hex was unleashed. 🪄 The chaos swirled, the order shattered, and the Spell of Chaos tried to take us down. But you? Unstoppable. 🧡 Drop a 🕸️ if you made it out alive.

10/21/2025

Stronger than cancer. Stronger every day. 💕

In honor of Breast Cancer Awareness Month, we’re celebrating Jean from OTF Altamonte Springs — a fighter, a survivor, and a true inspiration to our OTF family.

At 48, Jean was diagnosed with invasive breast cancer and underwent a mastectomy, chemo, and radiation. Determined not to let cancer define her, she refused to become a victim. Years later, she discovered Orangetheory and hasn’t looked back.

Now at 67, Jean works out 5-6 days a week, takes on every benchmark and challenge she can, and has crushed incredible milestones — from completing her first DriTri Sprint to winning her studio’s Transformation Challenge to finishing the Ultra 31.1 Marathon with 47.89 miles.

"I’m not a victim to cancer — Orangetheory Fitness is my therapy every day." 🧡 Jean, your story reminds us of the power of resilience, community, and showing up for yourself — at any age, in any season of life.

10/20/2025

Have you ever thought about how many people think about you? Right now, someone might be saying something kind about you. Someone might hear a song and think of you. Your presence matters — and it changes the world every day.

10/20/2025

Sit down. Send it. Survive. ✅ Drop those 200m benchmark times below ⬇️

10/17/2025

Brag boards are full and hearts are fuller. 🧡

10/17/2025

The real MVP today? Your lungs. 🫶🚣‍♀️ All that rowing and flag-capturing deserves some recognition — drop your team’s total meters below.

08/27/2024

Start your September with a burst of energy! Gather your friends and family for a fun-filled 5k event on the 1st at 9am at the Labor Day Lift Off. Whether you run, walk, or jog, everyone can join in the excitement. Don't miss out on this opportunity to enjoy a great time together! Click the link in our bio to sign up!!

07/25/2024

Orangetheory at Labor Day Lift Off 5K registration is OPEN! This race is open to EVERYONE, member or non-member. Tell your friends, neighbors and co-workers to join in on the fun! And, because you are an AMAZING OTF Member, you receive $5 OFF Your Registration! Text the studio for your secret code!
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🏃 When: Sunday, September 1, 2024 at 9am
👉 What: A beautiful 5K Loop around Memorial Park following Lift Off! Come early and watch 70 balloons take to the sky and enjoy shopping and vendors before the run!
✔️ Registration Fee: $25 with secret code! *Registration includes a t-shirt and medal!
🚗 Parking is FREE for all 5K participants. *Available on a first come first serve basis.*
💪 Register TODAY and Earn Your Orangetheory 5K Labor Day Lift-Off Medal.
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Register https://runsignup.com/Race/CO/ColoradoSprings/LaborDay5kRunpresentedbyOrangeTheory

06/03/2024

Who: you and any family, friend, or fellow OTF member 🍊
What: a 5k run/walk course 🏃 (with only small hills) ⛰️
When: Saturday June 15th, 8:00am
Where: Highland Heritage Park, Highlands Ranch, CO
WHY: to experience a fun fitness event outdoors, all proceeds support Girls on the Run Rockies 🧡 🧡
scan the QR code at your studio to sign up now!

05/15/2024

Join us Sunday for fun workout to support Help for Heroes!
Who: any OTF member, friend, or family member! All are welcome! 🧡
What: a Solo or Team Marathon Row OR an Outdoor Workout! 💪
When: Sunday May 19th 9:00 am (outdoor workout starts at 10 am)
Where: Spice Trade Brewery Greenwood Village, CO 🍻
Why: to challenge our fitness in a new capacity and support Help for Heroes, a local non-profit supporting mental health treatment for Active and Retired Military personnel.
Registration includes a beer post workout and all proceeds are donated to Help for Heroes.
Counts as a Mayhem workout!!
sign up here! --> https://runsignup.com/Race/CO/GreenwoodVillage/RowforHeroesMarathon?utm_source=Run%2520Sign%2520Up%2520&utm_medium=medium&utm_campaign=Row%2520for%2520Heroes

05/15/2024

What an incredible day at the first ever Regional Dri Tri on Saturday! 💪

Congratulations to the winners Ty Roder and Karen Goldburg! And a huge shout out to everyone who participated and cheered everyone on! Thank you for creating such an incredible OTF community that we are so grateful to be a part of everyday. 🧡🧡🧡

We can't wait to see you all (and some new competitors) again next year! Until then, keep pushing and keep spending your time in the Orange zone!

04/19/2024

🎉 Exciting news alert!
For the first time ever ... OTF Colorado will be hosting a Regional Dri Tri Championship and we couldn't be more pumped! 🙌
Top Male/Female winners of the Full Dri Tri will be invited to compete together in a Regional Championship on Saturday May 11th.
This competition has never been done before and we can't wait to see the energy and determination our amazing Orangetheory community brings to the table. 💪
Check out the video for movement standards and more information!
Happy Dri Tri this weekend! 🧡

03/29/2024

MILE HIGH MORE LIFE WINNER!! 🎉 Congratulations to Frances Kelly from for finishing Transformation Challenge and winning $2024!! 💪
Shoutout to all 3,000 finishers in the OTF Colorado region for completing Transformation Challenge and finding under the orange lights.
🧡

03/07/2024

Ever wonder what the different colors mean at OTF?

Let’s talk about the different heart rate levels we measure at OTF! This helps us see where your cardiovascular health is at and how you can track your heart rate levels:

🔵 Blue - resting heart rate, very casual
🟢 Green - Base, Challenging But Doable
🟠 Orange - Push, getting uncomfortable
❤️ Red - Maximum Effort, very uncomfortable

When we take some time to train your heart to recover, we help it get stronger. Cardio is so important and when you’re able to track it, you can start to improve your heart health.

Leave a ❤️ to celebrate your heart this month!

02/27/2024

When the gym is your form of self-love 💘

So many people don’t go to the gym because they view it as a punishment. What if you changed your mindset and thought of the gym as self-care, a way to honor your body, me-time, or a privilege?

If you want to be more consistent with your fitness journey, change your view to every part of it as an act of self-love that you GET to do!

Leave a ❤️ if you needed to hear this!

02/27/2024

Countdown to the best you 🍊⭐

Improving your health is literally one decision at a time. The more you choose yourself, the more results you’ll see!

Leave a 💪🏼 if this left you motivated!

02/13/2024

While a lot of people have already given up on their New Year’s Resolutions, our Orangetheory community is still over here gettin it! 🍊🏋️🏃♀️

Studies have shown that when it comes to creating health and fitness goals, you’re much more likely to achieve those goals if you have support from others.

That’s why Orangetheory is hands down the best option out there! Not only do you get workouts that are backed by science, but you also get one of the best, most supportive communities out there.

Book your next workout today, bring an accountability buddy, and continue working towards your goals!

02/13/2024

Get pumped to team up with your BFFs this month for Palentine’s Day at OTF! 💘

Book your class for Wednesday, February 14th in honor of Valentine’s Day! Capture the Flag Partner workout is ready for you and your bestie, significant other, or fellow OTFer!!

Unsure about partner workouts?? Don't stress!! Your coach will match you up and make sure you have an amazing workout!

Tag your gym bestie! 👯

Address

4243 East 136th Avenue
Thornton, CO
80602

Opening Hours

Monday	4:30am - 8:30pm
Tuesday	4:30am - 8:30pm
Wednesday	4:30am - 8:30pm
Thursday	4:30am - 8:30pm
Friday	4:30am - 7:15pm
Saturday	7am - 12:45pm
Sunday	7am - 12:45pm

Telephone

+17209291649

Website

https://www.orangetheory.com/en-us/locations/colorado/thornton/4243-e-136th-ave/

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